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A HeNe (Helium-Neon) laser has a beam power of 5.00 mW at a wavelength of 656 nm. Assume the beam is focused by a lens to a circular spot whose effective diameter is 15 wavelengths of the light.
a) What is the intensity of the focused beam?b) What is the radiation pressure exerted by the focused beam on a perfectly absorbing surface?c) How much momentum is carried by a 1 meter length of the focused beam?
A block of wood has a mass of 3.87 kg and a density of 584 kg/m3. It is to be loaded with lead so that it will float in water with 0.84 of its volume immersed. What mass of lead is needed if the lead is on top of the wood
A butterfly moves with a speed of v = 12.0 m/s east of North. The y-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis.
A wheelchair athlete is training on a stationary ergometer. Her wheel's angular velocity is 3 rev/s and diameter is 80.0 cm. What is the linear velocity at the wheel's circumference
q1. a lightning bolt transfers 6.0 coulombs of charge from a cloud to the ground in 2.0 10-3 second. what is the
A firefighter standing on a ladder 4.20 meters in the air is using a water hose to put out a fire. How much work is done per minute in lifting the water from the ground
Consider a cylindrical segment of a blood vessel 3.50cm long and 2.40mm in diameter. What additional outward force would such a vessel need to withstand in the person's feet compared to a similar vessel in her head?
A small bag of sand is suspended by a string of length L=1.2m. A bullet of mass m=8g, moving with initial speed vi = 600m/s in the horizontal direction, Determine the mass of the sand bag
A cockroach of mass m lies on the rim of a uniform disk of mass 4m that can rotate freely about its center like a merry-go-round. estimate the angular velocity of the cockroach-disk system
The angular momentum of a flywheel having a rotational inertia of 0.140 kg m2 about its axis decreases from 3.40 to 0.90 kg m2/s in 2.20 s. What is the average power of the flywheel
A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800km. The velocity of the satellite is (Me = 5.98 x 10^24 kg, Re = 6.37 x 10^6 m, G = 6.67 x 10-11 N • m2/kg2)
A can of Coke moving 16.6 m/s towards the right(the positive direction) collides with a can of Pepsi moving 3.67 m/s toward the left, what is the final velocity of the can of Pepsi
An electron moves with a speed of 8.0 × 10^6 m/s along the +-axis. It enters a region where there is a magnetic field of 2.5 T, Calculate the magnitude of the magnetic force on the electron
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